10
6.0 Installation Requirements
6.2
General
1. The LoWatt HR204 has a choice of 5 normal
speed settings and 3 boost speed settings. The
performance curve chart
(Section 4, Fig.5)
gives the ventilation rates at each fan speed
setting compared to the pressure drop of the
system.
2. The transmission of noise along ducts should
be reduced by fitting noise attenuation ducts.
(FS100. Part No 370426.)
6. 3
Ducting
1. The outside exhaust duct and outside air
intake duct should be sited a minimum of 2
metres apart to minimise the risk of exhaust
air being drawn back into the house.
2. The duct work system should be sized and
installed to minimise the pressure loss along it.
3. Using larger diameter pipes and keeping the
number of bends and fittings used to a minimum
will reduce the pressure drop and allow the unit
to be set at a lower fan speed.
5. Ducting should be insulated in cold areas to
minimise heat losses. All duct joints should be
suitably taped to ensure an air tight seal.
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Examples of different ducting & fittings
Bathroom
Living room or
bedroom
Terminals
minimum
2m apart
Outside
Wall
LoWatt HR204
Fig. 8
or kitchen
4. Bend radii for flexible ducting, measured to
the inside of bends, should be kept to at least
1x the duct diameter.